Add smtp4dev preset

[muety]

smtp4dev is one of my favorite testing / mocking tools when it comes to e-mail sending. Would be cool if gnomock had a preset for this (or a similar project), so you could easily stand up a mock SMTP server and test your application's e-mail sending functionality "end-to-end".

[orlangure]

Thank you for bringing this up!

Does this project have a docker image so a container can be created locally? Or is it a library that's imported into code and used without external processes?

[muety]

It comes as a Docker container (see here) and a REST API that you can use to change settings at runtime, so I think should be quite straightforward to integrate with gnomock.

[orlangure]

Nice 😼
Would you like to add it? I can guide you through the process if you are willing to work on it.

[muety]

Will wait for rnwood/smtp4dev#1610 to be resolved first.